| /* |
| http://code.google.com/p/inferno-os/source/browse/libbio/bwrite.c |
| |
| Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. |
| Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). All rights reserved. |
| |
| Permission is hereby granted, free of charge, to any person obtaining a copy |
| of this software and associated documentation files (the "Software"), to deal |
| in the Software without restriction, including without limitation the rights |
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| copies of the Software, and to permit persons to whom the Software is |
| furnished to do so, subject to the following conditions: |
| |
| The above copyright notice and this permission notice shall be included in |
| all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| THE SOFTWARE. |
| */ |
| |
| #include <u.h> |
| #include <libc.h> |
| #include <bio.h> |
| |
| long |
| Bwrite(Biobuf *bp, void *ap, long count) |
| { |
| long c; |
| unsigned char *p; |
| int i, n, oc; |
| |
| p = ap; |
| c = count; |
| oc = bp->ocount; |
| |
| while(c > 0) { |
| n = -oc; |
| if(n > c) |
| n = (int)c; |
| if(n == 0) { |
| if(bp->state != Bwactive) |
| return Beof; |
| i = (int)write(bp->fid, bp->bbuf, (size_t)bp->bsize); |
| if(i != bp->bsize) { |
| bp->state = Binactive; |
| return Beof; |
| } |
| bp->offset += i; |
| oc = -bp->bsize; |
| continue; |
| } |
| memmove(bp->ebuf+oc, p, (size_t)n); |
| oc += n; |
| c -= n; |
| p += n; |
| } |
| bp->ocount = oc; |
| return count-c; |
| } |